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Porovnn asferick se sferickou PCIOL

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Title: Porovnn asferick se sferickou PCIOL

1

Comparison of the Aspherical Tecnis Z9002 and the
Spherical Clariflex Silicone IOLs
Vinohrady Teaching Hospital, Prague, Czech
Republic
M.
Vokrojova MD, D. Sivekova MD,
L. Wagnerova MD Prof.
P. Kuchynka MD, PhD
The authors have no financial interest in the
presentation material
2
PURPOSE, OBJECTIVE

To evaluate quality of visual function after
cataract surgery with implantation of spherical
silicon intraocular lens to the one eye and
aspherical silicon intraocular lens to the second
eye of the same patient, and compare the results
between these two different types of lenses.
We conducted a prospective study,
to compare patients visual functions.

3
Endpoints included

postoperative BCVA
UNCVA
efficacy
wavefront - analysis
contrast sensitivity under photopic condition
subjective satisfaction of the patients

4
MATERIALS, METHODS

The group of the patients
40 eyes of 20 patients were randomly assigned
and examined by masked examiner
The mean age of the patients was 72,5 (59 - 84)
years.
11 (55) women, 9 (45) men.
Cataract condition was presented in all cases.
Mean preoperative BCVA 0,4 (0,32 - 0,8)
All surgeries were performed by an experienced
surgeon using phacoemulsification with the
Infinity Vision system (Alcon), topical
anesthesia and standard surgical procedure.

5
MATERIALS, METHODS
Tecnis Z9002
Clariflex

3-pieces, foldable, UV - blocking filter
Biconvex optic diameter 6,0 mm
Third generation silicone material
polydimethyl - diphenylsiloxane
OptiEdge design
A - constant 118,0
- Refractive index of 1.46

TECNIS IOL was developed with help of
wavefront technology.
3-pieces, foldable, UV-blocking filter
Biconvex optic diameter 6,0 mm
Third generation silicone material
polydimethyl - diphenylsiloxane
OptiEdge design
A - constant 118,4
- Aspherical anterior prolate surface
- Refractive index of 1.46
- Negative spherical aberration -0,27 µm

6
MATERIALS, METHODS

All patients were evaluated by a wavefront
analyzer (Wavescan), contrast sensitivity
(CSV-1000).
- wavefront - analysis was performed
monocularly with Wavescan (VISX) 3 months
postoperatively.
- contrast sensitivity was measured
monocularly with the best distance correction
with CSV 1000 instrument 3 months
postoperatively.

7
RESULTS
Aspherical IOL group (n20)
Non-aspherical IOL group (n20)
UNCVA 0,94 (0,63 - 1,0) BCVA 0,98 (0,8 -
1,0) Efficacy index post.UCVA/preop.BCVA
0,98/0,4
2,45
UNCVA 0,93 (0,63 - 1,0) BCVA 0,97 (0,8 -
1,0) Efficacy index post.UCVA/preop.BCVA
0,97/0,4
2,425
8
RESULTS
Aspherical IOL
Non-aspherical IOL
9
RESULTS

Results of the wavefront
analysis show that aspheric
intraocular lens significantly
reduces the occurrence of
spherical aberration (plt 0,01)

Examination was performed min.1 month
postop. Min. pupil size was 5,5 mm
10
RESULTS

Results of the examination of contrast
sensitivity show that aspheric intraocular lens
are significantly better than spherical lenses
(plt 0,05).

Aspherical IOL Non-asperical IOL

85 cd/m2

11
Discussion

The theoretical preclinical calculations studies
suggest that spherical aberration of the eye
after cataract surgery using the anterior prolate
surface lenses can be modified.
The anterior prolate surface of the Tecnis Z9002
results in a negative spherical aberration of
0,27 µm for 6,0 mm pupil to compensate positive
spherical aberration of the cornea.
The recent studies found that these modified
lenses can improve contrast sensitivity under
mesopic and photopic conditions.
References
1. Packer M. Fine IH. Hoffman RS. Prospective
randomized trial of an anterior surface modified
prolate intraocular lens. J Refract Surg
200218692-696
2. Packer M. Fine IH. Hoffman RS. Improved
functional vision with modified prolate
intraocular lens. J Cataract Refract Surg 2004
30 986-992
3. Beiko GHH. Personalized correction of
spherical aberration in catarct surgery. 2007
33 1455-1460.

12
CONCLUSSION

Our results confirm that use of aspherical lenses
can reduce occurrence of spherical aberration and
can improve the visual performance of patients.
The benefit of this lens can be appreciated only
from patients with increased visual demands like
car drivers, like our results suggest.

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